diff --git a/admin/report/courseoverview/index.php b/admin/report/courseoverview/index.php
index 74c6d2400ce..da91b6109c6 100644
--- a/admin/report/courseoverview/index.php
+++ b/admin/report/courseoverview/index.php
@@ -27,9 +27,9 @@
 
     $reportoptions = stats_get_report_options($course->id,STATS_MODE_RANKED);
 
-    $earliestday = $DB->get_field_sql('SELECT timeend FROM {stats_daily} ORDER BY timeend');
-    $earliestweek = $DB->get_field_sql('SELECT timeend FROM {stats_weekly} ORDER BY timeend');
-    $earliestmonth = $DB->get_field_sql('SELECT timeend FROM {stats_monthly} ORDER BY timeend');
+    $earliestday = $DB->get_field_sql('SELECT MIN(timeend) FROM {stats_daily}');
+    $earliestweek = $DB->get_field_sql('SELECT MIN(timeend) FROM {stats_weekly}');
+    $earliestmonth = $DB->get_field_sql('SELECT MIN(timeend) FROM {stats_monthly}');
 
     if (empty($earliestday)) $earliestday = time();
     if (empty($earliestweek)) $earliestweek = time();
diff --git a/course/report/stats/index.php b/course/report/stats/index.php
index adca0117e76..6af3bc74a62 100644
--- a/course/report/stats/index.php
+++ b/course/report/stats/index.php
@@ -37,9 +37,14 @@
 
     require_login($course);
     $context = get_context_instance(CONTEXT_COURSE, $course->id);
-
     require_capability('coursereport/stats:view', $context);
 
+    $PAGE->set_url(new moodle_url('/course/report/stats/index.php', array('course' => $course->id,
+                                                                          'report' => $report,
+                                                                          'time'   => $time,
+                                                                          'mode'   => $mode,
+                                                                          'userid' => $userid)));
+
     add_to_log($course->id, "course", "report stats", "report/stats/index.php?course=$course->id", $course->id);
     stats_check_uptodate($course->id);
 
@@ -52,10 +57,8 @@
 
         $PAGE->set_title("$course->shortname: $strstats");
         $PAGE->set_heading($course->fullname);
-        //$PAGE->set_headingmenu();
-        $PAGE->navbar->add($strreports, new moodle_url('/course/report.php', array('id'=>$course->id)));
-        $PAGE->navbar->add($strstats);
-        $PAGE->headingmenu(report_stats_mode_menu($course, $mode, $time, "$CFG->wwwroot/course/report/stats/index.php"));
+        $PAGE->set_pagelayout('report');
+        $PAGE->set_headingmenu(report_stats_mode_menu($course, $mode, $time, "$CFG->wwwroot/course/report/stats/index.php"));
         echo $OUTPUT->header();
     }
 
diff --git a/course/report/stats/lib.php b/course/report/stats/lib.php
index 095d13cded2..ed31e78cc9a 100644
--- a/course/report/stats/lib.php
+++ b/course/report/stats/lib.php
@@ -46,7 +46,7 @@ function report_stats_mode_menu($course, $mode, $time, $url) {
     $popupurl = $url."?course=$course->id&time=$time";
     $select = new single_select(new moodle_url($popupurl), 'mode', $options, $mode, null);
     $select->formid = 'switchmode';
-    echo $OUTPUT->render($select);
+    return $OUTPUT->render($select);
 }
 
 
@@ -54,13 +54,13 @@ function report_stats_timeoptions($mode) {
     global $CFG, $DB;
 
     if ($mode == STATS_MODE_DETAILED) {
-        $earliestday = $DB->get_field_sql('SELECT timeend FROM {stats_user_daily} ORDER BY timeend');
-        $earliestweek = $DB->get_field_sql('SELECT timeend FROM {stats_user_weekly} ORDER BY timeend');
-        $earliestmonth = $DB->get_field_sql('SELECT timeend FROM {stats_user_monthly} ORDER BY timeend');
+        $earliestday = $DB->get_field_sql('SELECT MIN(timeend) FROM {stats_user_daily}');
+        $earliestweek = $DB->get_field_sql('SELECT MIN(timeend) FROM {stats_user_weekly}');
+        $earliestmonth = $DB->get_field_sql('SELECT MIN(timeend) FROM {stats_user_monthly}');
     } else {
-        $earliestday = $DB->get_field_sql('SELECT timeend FROM {stats_daily} ORDER BY timeend');
-        $earliestweek = $DB->get_field_sql('SELECT timeend FROM {stats_weekly} ORDER BY timeend');
-        $earliestmonth = $DB->get_field_sql('SELECT timeend FROM {stats_monthly} ORDER BY timeend');
+        $earliestday = $DB->get_field_sql('SELECT MIN(timeend) FROM {stats_daily}');
+        $earliestweek = $DB->get_field_sql('SELECT MIN(timeend) FROM {stats_weekly}');
+        $earliestmonth = $DB->get_field_sql('SELECT MIN(timeend) FROM {stats_monthly}');
     }
 
 
@@ -86,8 +86,8 @@ function stats_report_extend_navigation($navigation, $course, $context) {
     global $CFG, $OUTPUT;
     if (has_capability('coursereport/stats:view', $context)) {
         if (!empty($CFG->enablestats)) {
-            $url = new moodle_url('/course/report/stats/index.php', array('id'=>$course->id));
+            $url = new moodle_url('/course/report/stats/index.php', array('course'=>$course->id));
             $navigation->add(get_string('stats'), $url, navigation_node::TYPE_SETTING, null, null, new pix_icon('i/report', ''));
         }
     }
-}
\ No newline at end of file
+}
diff --git a/course/report/stats/report.php b/course/report/stats/report.php
index 65962dd5967..e13f06423b6 100644
--- a/course/report/stats/report.php
+++ b/course/report/stats/report.php
@@ -98,7 +98,7 @@
                 .' ORDER BY timeend DESC';
         }
 
-        $stats = $DB->get_records_sql($sql, $params);
+        $stats = $DB->get_records_sql($sql);
 
         if (empty($stats)) {
             echo $OUTPUT->notification(get_string('statsnodata'));
diff --git a/lib/statslib.php b/lib/statslib.php
index b52a7c482d0..8a499176ffd 100644
--- a/lib/statslib.php
+++ b/lib/statslib.php
@@ -854,13 +854,13 @@ function stats_get_start_from($str) {
     global $CFG, $DB;
 
     // are there any data in stats table? Should not be...
-    if ($timeend = $DB->get_field_sql('SELECT timeend FROM {stats_'.$str.'} ORDER BY timeend DESC')) {
+    if ($timeend = $DB->get_field_sql('SELECT MAX(timeend) FROM {stats_'.$str.'}')) {
         return $timeend;
     }
     // decide what to do based on our config setting (either all or none or a timestamp)
     switch ($CFG->statsfirstrun) {
         case 'all':
-            if ($firstlog = $DB->get_field_sql('SELECT time FROM {log} ORDER BY time ASC')) {
+            if ($firstlog = $DB->get_field_sql('SELECT MIN(time) FROM {log}')) {
                 return $firstlog;
             }
         default:
@@ -1333,8 +1333,8 @@ function stats_get_report_options($courseid,$mode) {
     case STATS_MODE_GENERAL:
         $reportoptions[STATS_REPORT_ACTIVITY] = get_string('statsreport'.STATS_REPORT_ACTIVITY);
         if ($courseid != SITEID && $context = get_context_instance(CONTEXT_COURSE, $courseid)) {
-            $sql = 'SELECT r.id,r.name FROM {role} r JOIN {stats_daily} s ON s.roleid = r.id WHERE s.courseid = '.$courseid;
-            if ($roles = $DB->get_records_sql($sql)) {
+            $sql = 'SELECT r.id, r.name FROM {role} r JOIN {stats_daily} s ON s.roleid = r.id WHERE s.courseid = :courseid GROUP BY s.roleid';
+            if ($roles = $DB->get_records_sql($sql, array('courseid' => $courseid))) {
                 foreach ($roles as $role) {
                     $reportoptions[STATS_REPORT_ACTIVITYBYROLE.$role->id] = get_string('statsreport'.STATS_REPORT_ACTIVITYBYROLE). ' '.$role->name;
                 }